Mount arm



FIG. 1 is a front perspective view of a mount arm showing our new design;

FIG. 2 is a front elevational view of the mount arm shown in FIG. 1;

FIG. 3 is a rear elevational view of the mount arm shown in FIG. 1;

FIG. 4 is a right-side elevational view of the mount arm shown in FIG. 1;

FIG. 5 is a left-side elevational view of the mount arm shown in FIG. 1;

FIG. 6 is a top plan view of the mount arm shown in FIG. 1; and,

FIG. 7 is a bottom plan view of the mount arm shown in FIG. 1.

The broken lines shown in the drawings represent portions of the mount arm that form no part of the claimed design. 

CLAIM The ornamental design for a mount arm, as shown and described. 